happy as a lark vs satisfactory

happy as a lark

adj
  • Very happy (sometimes with the extra connotations of being carefree or unaware of grimmer realities). 

satisfactory

adj
  • Causing satisfaction; agreeable or pleasant; satisfying. 

  • Done to satisfaction; adequate or sufficient. 

  • Making atonement for a sin; expiatory. 

noun
  • The rating given to somebody or something that meets requirements without exceeding them. 

  • Somebody or something that meets requirements without exceeding them. 

How often have the words happy as a lark and satisfactory occurred in a corpus of books? (source: Google Ngram Viewer )